Cisco  SFP GLC-LH-SM-C Mini-GBIC Transceiver Module

Features and benefits of CISCO GLC-LH-SMD
● Hot swappable to maximize uptime and simplify serviceability
● Flexibility of media and interface choice on a port-by-port basis, so you can “pay as you populate”
● Robust design for enhanced reliability
● Supports Digital Optical Monitoring (DOM) capability

1000BASE-T SFP for copper networks
The 1000BASE-T SFP operates on standard Category 5 unshielded twisted-pair copper cabling of link lengths up to 100 m (328 ft).

The Cisco 1000BASE-T SFP modules support 10/100/1000 auto negotiation and Auto MDI/MDIX.

1000BASE-SX SFP for multimode fiber only
The 1000BASE-SX SFP, compatible with the IEEE 802.3z 1000BASE-SX standard, operates on legacy 50 μm multimode fiber links up to 550 m and on 62.5 μm Fiber Distributed Data Interface (FDDI)-grade multimode fibers up to 220 m.

It can support up to 1km over laser-optimized 50 μm multimode fiber cable.

1000BASE-LX/LH SFP for both multimode and single-mode fibers
The 1000BASE-LX/LH SFP, compatible with the IEEE 802.3z 1000BASE-LX standard, operates on standard single-mode fiber-optic link spans of up to 10 km and up to 550 m on any multimode fibers.

When used over legacy multimode fiber type, the transmitter should be coupled through a mode conditioning patch cable.

1000BASE-EX SFP for long-reach single-mode fibers
The 1000BASE-EX SFP operates on standard single-mode fiber-optic link spans of up to 40 km in length.

A 5-dB inline optical attenuator should be inserted between the fiber-optic cable and the receiving port on the SFP at each end of the link for back-to-back connectivity.

1000BASE-ZX SFP for long-reach single-mode fibers
The 1000BASE-ZX SFP operates on standard single-mode fiber-optic link spans of up to approximately 70 km in length.

The CISCO GLC-LH-SMD SFP provides an optical link budget of 21 dB, but the precise link span length depends on multiple factors such as fiber quality, number of splices, and connectors.

When shorter distances of Single-Mode Fiber (SMF), CISCO GLC-LH-SMD, are used, it might be necessary to insert an inline optical attenuator in the link to avoid overloading the receiver.

A 10-dB inline optical attenuator should be inserted between the fiber-optic cable plant and the receiving port on the SFP at each end of the link whenever the fiber-optic cable span loss is less than 8 dB.

100/1000BASE-LX SFP for long-reach single-mode fibers
The dual-rate 100M/1G 10Km SFP is interoperable with the IEEE 100BASE-LX and 1000BASE-LX/LH standards.

The GLC-GE-DR-LX SFP also supports Digital Optical Monitoring (DOM) functions according to the industry-standard SFF-8472 Multisource Agreement (MSA).

This feature gives the end user the ability to monitor real-time parameters of the SFP, such as optical output power, optical input power, temperature, laser bias current, and transceiver supply voltage.

Cisco SFP Operation at 100M
The GLC-GE-DR-LX SFP can interoperate with other 100M SFPs/interfaces as long as those are based on 100BASE-LX10 standard.

A 5dB attenuator is needed on the path of dual-rate SFP Tx and 100BASE-LX10 interface Rx. No attenuator is needed on the other fiber strand.

SFP Operation at 1G
The GLC-GE-DR-LX SFP can interoperate with other 1G SFPs/interfaces as long as those are based on 1000BASE-LX/LH standard. No attenuator is needed in any fiber strand.